var myWin;
window.childOpened = false;

function popup (page, width, height, scrollbars, status) {

	LeftPosition = (screen.width-width) / 2
	TopPosition = (screen.height-height) / 2

	attributes = 'scrollbars='+scrollbars+'toolbar=0,location=0,directories=0,status='+status+',menubar=0,resizable=no,height='+height+',width='+width+',top='+TopPosition+',left='+LeftPosition

	myWin = window.open(page, "_blank", attributes)
	myWin.focus();

	window.childOpened = true;

}

function isClosed() {
	if (window.childOpened) {
		if (myWin.closed) {
			window.location = window.location;
			return;
		}
	}
	setTimeout('isClosed()',500);
}